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block: Merge .bdrv_co_writev{,_flags} in drivers

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We have too many driver callback interfaces; simplify the mess
somewhat by merging the flags parameter of .bdrv_co_writev_flags()
into .bdrv_co_writev().  Note that as long as a driver doesn't set
.supported_write_flags, the flags argument will be 0 and behavior is
identical.  Also note that the public function bdrv_co_writev() still
lacks a flags argument; so the driver signature is thus intentionally
slightly different.  But that's not the end of the world, nor the first
time that the driver interface differs slightly from the public
interface.

Ideally, we should be rewriting all of these drivers to use modern
byte-based interfaces.  But that's a more invasive patch to write
and audit, compared to the simplification done here.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2018-04-24 17:01:57 -05:00 committed by Kevin Wolf
parent edfab6a08b
commit e18a58b4e3
11 changed files with 32 additions and 24 deletions
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4
block/gluster.c
View File

@ -1194,8 +1194,10 @@ static coroutine_fn int qemu_gluster_co_readv(BlockDriverState *bs,
static coroutine_fn int qemu_gluster_co_writev(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors,
QEMUIOVector *qiov)
QEMUIOVector *qiov,
int flags)
{
assert(!flags);
return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 1);
}

13
block/io.c
View File

@ -1000,15 +1000,10 @@ static int coroutine_fn bdrv_driver_pwritev(BlockDriverState *bs,
assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
assert((bytes >> BDRV_SECTOR_BITS) <= BDRV_REQUEST_MAX_SECTORS);
if (drv->bdrv_co_writev_flags) {
ret = drv->bdrv_co_writev_flags(bs, sector_num, nb_sectors, qiov,
flags & bs->supported_write_flags);
flags &= ~bs->supported_write_flags;
} else {
assert(drv->bdrv_co_writev);
assert(!bs->supported_write_flags);
ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov);
}
assert(drv->bdrv_co_writev);
ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov,
flags & bs->supported_write_flags);
flags &= ~bs->supported_write_flags;
emulate_flags:
if (ret == 0 && (flags & BDRV_REQ_FUA)) {

8
block/iscsi.c
View File

@ -556,8 +556,8 @@ static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun,
}
static int coroutine_fn
iscsi_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
QEMUIOVector *iov, int flags)
iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
QEMUIOVector *iov, int flags)
{
IscsiLun *iscsilun = bs->opaque;
struct IscsiTask iTask;
@ -2220,7 +2220,7 @@ static BlockDriver bdrv_iscsi = {
.bdrv_co_pdiscard = iscsi_co_pdiscard,
.bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
.bdrv_co_readv = iscsi_co_readv,
.bdrv_co_writev_flags = iscsi_co_writev_flags,
.bdrv_co_writev = iscsi_co_writev,
.bdrv_co_flush_to_disk = iscsi_co_flush,
#ifdef __linux__
@ -2255,7 +2255,7 @@ static BlockDriver bdrv_iser = {
.bdrv_co_pdiscard = iscsi_co_pdiscard,
.bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
.bdrv_co_readv = iscsi_co_readv,
.bdrv_co_writev_flags = iscsi_co_writev_flags,
.bdrv_co_writev = iscsi_co_writev,
.bdrv_co_flush_to_disk = iscsi_co_flush,
#ifdef __linux__

4
block/parallels.c
View File

@ -311,13 +311,15 @@ static int coroutine_fn parallels_co_block_status(BlockDriverState *bs,
}
static coroutine_fn int parallels_co_writev(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
int64_t sector_num, int nb_sectors,
QEMUIOVector *qiov, int flags)
{
BDRVParallelsState *s = bs->opaque;
uint64_t bytes_done = 0;
QEMUIOVector hd_qiov;
int ret = 0;
assert(!flags);
qemu_iovec_init(&hd_qiov, qiov->niov);
while (nb_sectors > 0) {

6
block/qcow.c
View File

@ -720,7 +720,8 @@ static coroutine_fn int qcow_co_readv(BlockDriverState *bs, int64_t sector_num,
}
static coroutine_fn int qcow_co_writev(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov)
int nb_sectors, QEMUIOVector *qiov,
int flags)
{
BDRVQcowState *s = bs->opaque;
int index_in_cluster;
@ -731,6 +732,7 @@ static coroutine_fn int qcow_co_writev(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf;
void *orig_buf;
assert(!flags);
s->cluster_cache_offset = -1; /* disable compressed cache */
/* We must always copy the iov when encrypting, so we
@ -1110,7 +1112,7 @@ qcow_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset,
if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
/* could not compress: write normal cluster */
ret = qcow_co_writev(bs, offset >> BDRV_SECTOR_BITS,
bytes >> BDRV_SECTOR_BITS, qiov);
bytes >> BDRV_SECTOR_BITS, qiov, 0);
if (ret < 0) {
goto fail;
}

3
block/qed.c
View File

@ -1437,8 +1437,9 @@ static int coroutine_fn bdrv_qed_co_readv(BlockDriverState *bs,
static int coroutine_fn bdrv_qed_co_writev(BlockDriverState *bs,
int64_t sector_num, int nb_sectors,
QEMUIOVector *qiov)
QEMUIOVector *qiov, int flags)
{
assert(!flags);
return qed_co_request(bs, sector_num, qiov, nb_sectors, QED_AIOCB_WRITE);
}

4
block/replication.c
View File

@ -260,7 +260,8 @@ out:
static coroutine_fn int replication_co_writev(BlockDriverState *bs,
int64_t sector_num,
int remaining_sectors,
QEMUIOVector *qiov)
QEMUIOVector *qiov,
int flags)
{
BDRVReplicationState *s = bs->opaque;
QEMUIOVector hd_qiov;
@ -271,6 +272,7 @@ static coroutine_fn int replication_co_writev(BlockDriverState *bs,
int ret;
int64_t n;
assert(!flags);
ret = replication_get_io_status(s);
if (ret < 0) {
goto out;

4
block/sheepdog.c
View File

@ -2614,13 +2614,15 @@ static void sd_aio_complete(SheepdogAIOCB *acb)
}
static coroutine_fn int sd_co_writev(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov)
int nb_sectors, QEMUIOVector *qiov,
int flags)
{
SheepdogAIOCB acb;
int ret;
int64_t offset = (sector_num + nb_sectors) * BDRV_SECTOR_SIZE;
BDRVSheepdogState *s = bs->opaque;
assert(!flags);
if (offset > s->inode.vdi_size) {
ret = sd_truncate(bs, offset, PREALLOC_MODE_OFF, NULL);
if (ret < 0) {

4
block/ssh.c
View File

@ -1164,11 +1164,13 @@ static int ssh_write(BDRVSSHState *s, BlockDriverState *bs,
static coroutine_fn int ssh_co_writev(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov)
int nb_sectors, QEMUIOVector *qiov,
int flags)
{
BDRVSSHState *s = bs->opaque;
int ret;
assert(!flags);
qemu_co_mutex_lock(&s->lock);
ret = ssh_write(s, bs, sector_num * BDRV_SECTOR_SIZE,
nb_sectors * BDRV_SECTOR_SIZE, qiov);

4
block/vhdx.c
View File

@ -1226,7 +1226,8 @@ int vhdx_user_visible_write(BlockDriverState *bs, BDRVVHDXState *s)
}
static coroutine_fn int vhdx_co_writev(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov)
int nb_sectors, QEMUIOVector *qiov,
int flags)
{
int ret = -ENOTSUP;
BDRVVHDXState *s = bs->opaque;
@ -1242,6 +1243,7 @@ static coroutine_fn int vhdx_co_writev(BlockDriverState *bs, int64_t sector_num,
uint64_t bat_prior_offset = 0;
bool bat_update = false;
assert(!flags);
qemu_iovec_init(&hd_qiov, qiov->niov);
qemu_co_mutex_lock(&s->lock);

2
include/block/block_int.h
View File

@ -174,8 +174,6 @@ struct BlockDriver {
int coroutine_fn (*bdrv_co_preadv)(BlockDriverState *bs,
uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags);
int coroutine_fn (*bdrv_co_writev)(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
int coroutine_fn (*bdrv_co_writev_flags)(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, int flags);
/**
* @offset: position in bytes to write at